/*
 * Copyright (C) 2014 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.example.android.bluetoothchat;

import android.app.ActionBar;
import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.text.TextUtils;
import android.view.KeyEvent;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.view.inputmethod.EditorInfo;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

import com.example.android.bluetoothchat.uitls.ShareUtils;
import com.example.android.bluetoothchat.uitls.StringUtils;
import com.example.android.common.logger.Log;

import java.util.Set;

/**
 * This fragment controls Bluetooth to communicate with other devices.
 */
public class ClientFragment extends Fragment {
    
    private static final String TAG = "ClientFragment";
    
    // 保存设备id
    private static final String SAVE_DEVICE_KEY = "save_device_key";
    // 保存进入时间
    private static final String KEY_ENTER_TIME = "key_enter_time";
    // 是否正在停车，没有出库
    private static final String KEY_IS_STOPING = "key_is_stoping";
    
    // Intent request codes
    private static final int REQUEST_CONNECT_DEVICE_SECURE = 1;
    private static final int REQUEST_CONNECT_DEVICE_INSECURE = 2;
    private static final int REQUEST_ENABLE_BT = 3;
    
    // Layout Views
    private ListView mConversationView;
    private EditText mOutEditText;
    private Button mSendButton;
    private TextView mWelcomText;
    private TextView mCash;
    private Button mEnterButton;
    private Button mOutButton;
    private View mTime;
    private TextView mEnterTime;
    
    /**
     * Name of the connected device
     */
    private String mConnectedDeviceName = null;
    
    /**
     * Array adapter for the conversation thread
     */
    private ArrayAdapter<String> mConversationArrayAdapter;
    
    /**
     * String buffer for outgoing messages
     */
    private StringBuffer mOutStringBuffer;
    
    /**
     * Local Bluetooth adapter
     */
    private BluetoothAdapter mBluetoothAdapter = null;
    
    /**
     * Member object for the chat services
     */
    private BluetoothChatService mChatService = null;
    
    private BluetoothDevice mChooseDevice;
    
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setHasOptionsMenu(true);
        // Get local Bluetooth adapter
        mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
        
        // If the adapter is null, then Bluetooth is not supported
        if (mBluetoothAdapter == null) {
            FragmentActivity activity = getActivity();
            Toast.makeText(activity, "蓝牙不可用", Toast.LENGTH_LONG).show();
            activity.finish();
        }
    }
    
    
    @Override
    public void onStart() {
        super.onStart();
        // If BT is not on, request that it be enabled.
        // setupChat() will then be called during onActivityResult
        // 判断蓝牙是否开启，没有则请求开启
        if (!mBluetoothAdapter.isEnabled()) {
            Intent enableIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
            startActivityForResult(enableIntent, REQUEST_ENABLE_BT);
            // Otherwise, setup the chat session
        }
        else if (mChatService == null) {
            setupChat();
        }
    }
    
    @Override
    public void onDestroy() {
        super.onDestroy();
        // 界面销毁时，停止蓝牙服务
        if (mChatService != null) {
            mChatService.stop();
        }
    }
    
    @Override
    public void onResume() {
        super.onResume();
        
        // Performing this check in onResume() covers the case in which BT was
        // not enabled during onStart(), so we were paused to enable it...
        // onResume() will be called when ACTION_REQUEST_ENABLE activity returns.
        if (mChatService != null) {
            // Only if the state is STATE_NONE, do we know that we haven't started already
            if (mChatService.getState() == BluetoothChatService.STATE_NONE) {
                // Start the Bluetooth chat services
                mChatService.start();
            }
        }
    }
    
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container,
                             @Nullable Bundle savedInstanceState) {
        // 加载页面
        return inflater.inflate(R.layout.fragment_bluetooth_client, container, false);
    }
    
    @Override
    public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
        mConversationView = (ListView) view.findViewById(R.id.in);
        mOutEditText = (EditText) view.findViewById(R.id.edit_text_out);
        mSendButton = (Button) view.findViewById(R.id.button_send);
        mWelcomText = (TextView) view.findViewById(R.id.tv_welcome_tip);
        mCash = (TextView) view.findViewById(R.id.tv_cash);
        
        
        mTime = (View) view.findViewById(R.id.ll_time);
        mEnterTime = (TextView) view.findViewById(R.id.tv_enter_time);
        
        mEnterButton = (Button) view.findViewById(R.id.btn_enter);
        mOutButton = (Button) view.findViewById(R.id.btn_out);
        
        mEnterTime.setVisibility(View.VISIBLE);
        mEnterTime.setText(getString(R.string.enter_time, "----"));
        
        // 进入按钮
        mEnterButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                
                // 判断是否连接到设备
                if (mChatService.getState() != BluetoothChatService.STATE_CONNECTED) {
                    Toast.makeText(getActivity(), R.string.not_connected, Toast.LENGTH_SHORT).show();
                    return;
                }
                if (mChooseDevice != null) {
                    showEnterInfo();
                    // 发送请求进入车库消息（报文“enter==address”）
                    String text = StringUtils.KEY_ENTER + StringUtils.MSG_DEIVDER + mChooseDevice.getAddress();
                    sendMessage(text);
                }
            }
        });
        
        // 退出按钮
        mOutButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (mChatService.getState() != BluetoothChatService.STATE_CONNECTED) {
                    Toast.makeText(getActivity(), R.string.not_connected, Toast.LENGTH_SHORT).show();
                    return;
                }
                if (mChooseDevice != null) {
                    showOutInfo();
                    // 发送请求离开车库消息（报文“out==address”）
                    String text = StringUtils.KEY_OUT + StringUtils.MSG_DEIVDER + mChooseDevice.getAddress();
                    sendMessage(text);
                }
            }
        });
    }
    
    /**
     * 显示进入信息
     */
    private void showEnterInfo() {
        mCash.setVisibility(View.GONE);
        
        // 显示进入时间
        mEnterTime.setVisibility(View.VISIBLE);
        String entertime = ShareUtils.getString(KEY_ENTER_TIME, "");
        if (!TextUtils.isEmpty(entertime)) {
            mEnterTime.setText(getString(R.string.enter_time, StringUtils.getDateTime(Long.parseLong(entertime))));
        }
        // 保存进入时间(没有保存过时间，同时没有正在停车)
        if (!ShareUtils.getBoolean(KEY_IS_STOPING, false)) {
            ShareUtils.putString(KEY_ENTER_TIME, System.currentTimeMillis() + "");
            ShareUtils.putBoolean(KEY_IS_STOPING, true);
            // 显示进入时间
            mEnterTime.setText(getString(R.string.enter_time, StringUtils.getDateTime(System.currentTimeMillis())));
        }
        
        // 如果当前用户在停车状态，显示退出按钮，隐藏进入按钮
        if (ShareUtils.getBoolean(KEY_IS_STOPING, false)) {
            mEnterButton.setVisibility(View.GONE);
            mOutButton.setVisibility(View.VISIBLE);
        }
        else {
            // 没有在停车，隐藏退出按钮，显示进入按钮
            mOutButton.setVisibility(View.GONE);
            mEnterButton.setVisibility(View.VISIBLE);
        }
    }
    
    /**
     * 显示退出信息
     */
    private void showOutInfo() {
        String enterTime = ShareUtils.getString(KEY_ENTER_TIME, "");
        if (!TextUtils.isEmpty(enterTime)) {
            // 显示欢迎字样
            mWelcomText.setVisibility(View.VISIBLE);
            mWelcomText.setText(getString(R.string.welcome_text_next));
            mCash.setVisibility(View.VISIBLE);
            
            long start = Long.parseLong(enterTime);
            String showTime = StringUtils.getTimeDifference(start, System.currentTimeMillis());
            // 显示进入时间
            mEnterTime.setText(getString(R.string.stop_time, showTime));
            long cash = StringUtils.calcuteNeedpay(start, System.currentTimeMillis());
            mCash.setText(getString(R.string.stop_cash, cash + ""));
            
            // 保存离开时间
            ShareUtils.putBoolean(KEY_IS_STOPING, false);
            // 清空上次保存的时间
            ShareUtils.putString(KEY_ENTER_TIME, "");
    
            // 如果当前用户没有在停车状态，显示进入按钮，隐藏退出按钮
            if (!ShareUtils.getBoolean(KEY_IS_STOPING, false)) {
                mEnterButton.setVisibility(View.VISIBLE);
                mOutButton.setVisibility(View.GONE);
            }
            else {
                // 如果当前用户在停车状态，显示退出按钮，隐藏进入按钮
                mOutButton.setVisibility(View.VISIBLE);
                mEnterButton.setVisibility(View.GONE);
            }
        }
    }
    
    /**
     * Set up the UI and background operations for chat.
     */
    private void setupChat() {
        Log.d(TAG, "setupChat()");
        
        // Initialize the array adapter for the conversation thread
        mConversationArrayAdapter = new ArrayAdapter<String>(getActivity(), R.layout.message);
        
        mConversationView.setAdapter(mConversationArrayAdapter);
        
        // Initialize the compose field with a listener for the return key
        mOutEditText.setOnEditorActionListener(mWriteListener);
        
        // Initialize the send button with a listener that for click events
        mSendButton.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                // Send a message using content of the edit text widget
                View view = getView();
                if (null != view) {
                    TextView textView = (TextView) view.findViewById(R.id.edit_text_out);
                    String message = textView.getText().toString();
                    sendMessage(message);
                }
            }
        });
        
        // Initialize the BluetoothChatService to perform bluetooth connections
        mChatService = new BluetoothChatService(getActivity(), mHandler);
        
        // Initialize the buffer for outgoing messages
        mOutStringBuffer = new StringBuffer("");
        
        if (mChatService.getState() != BluetoothChatService.STATE_CONNECTED) {
            mSendButton.postDelayed(new Runnable() {
                @Override
                public void run() {
                    autoConntect2Device();
                }
            }, 200);
        }
    }
    
    /**
     * 自动连接到保存的device
     */
    private void autoConntect2Device() {
        // 获取保存的设备地址
        String address = ShareUtils.getString(SAVE_DEVICE_KEY, "");
        if (!TextUtils.isEmpty(address)) {
            BluetoothAdapter mAdapter = BluetoothAdapter.getDefaultAdapter();
            Set<BluetoothDevice> devices = mAdapter.getBondedDevices();
            // 如果当前可用的设备中有保存过的设备，则自动连接
            for (BluetoothDevice device : devices) {
                if (address.endsWith(device.getAddress())) {
                    Intent intent = new Intent();
                    intent.putExtra(DeviceListActivity.EXTRA_DEVICE_ADDRESS, address);
                    // 发送连接请求
                    connectDevice(intent, true);
                    Toast.makeText(getActivity(), "自动连接中...", Toast.LENGTH_SHORT).show();
                    break;
                }
            }
        }
    }
    
    /**
     * Makes this device discoverable.
     */
    private void ensureDiscoverable() {
        if (mBluetoothAdapter.getScanMode() != BluetoothAdapter.SCAN_MODE_CONNECTABLE_DISCOVERABLE) {
            Intent discoverableIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);
            discoverableIntent.putExtra(BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION, 300);
            startActivity(discoverableIntent);
        }
    }
    
    /**
     * Sends a message.
     *
     * @param message A string of text to send.
     */
    private void sendMessage(String message) {
        // Check that we're actually connected before trying anything
        if (mChatService.getState() != BluetoothChatService.STATE_CONNECTED) {
            Toast.makeText(getActivity(), R.string.not_connected, Toast.LENGTH_SHORT).show();
            return;
        }
        
        // Check that there's actually something to send
        if (message.length() > 0) {
            // Get the message bytes and tell the BluetoothChatService to write
            byte[] send = message.getBytes();
            mChatService.write(send);
            
            // Reset out string buffer to zero and clear the edit text field
            mOutStringBuffer.setLength(0);
            mOutEditText.setText(mOutStringBuffer);
        }
    }
    
    /**
     * The action listener for the EditText widget, to listen for the return key
     */
    private TextView.OnEditorActionListener mWriteListener = new TextView.OnEditorActionListener() {
        public boolean onEditorAction(TextView view, int actionId, KeyEvent event) {
            // If the action is a key-up event on the return key, send the message
            if (actionId == EditorInfo.IME_NULL && event.getAction() == KeyEvent.ACTION_UP) {
                String message = view.getText().toString();
                sendMessage(message);
            }
            return true;
        }
    };
    
    /**
     * Updates the status on the action bar.
     *
     * @param resId a string resource ID
     */
    private void setStatus(int resId) {
        FragmentActivity activity = getActivity();
        if (null == activity) {
            return;
        }
        final ActionBar actionBar = activity.getActionBar();
        if (null == actionBar) {
            return;
        }
        actionBar.setSubtitle(resId);
    }
    
    /**
     * Updates the status on the action bar.
     *
     * @param subTitle status
     */
    private void setStatus(CharSequence subTitle) {
        FragmentActivity activity = getActivity();
        if (null == activity) {
            return;
        }
        final ActionBar actionBar = activity.getActionBar();
        if (null == actionBar) {
            return;
        }
        actionBar.setSubtitle(subTitle);
    }
    
    /**
     * The Handler that gets information back from the BluetoothChatService
     */
    private final Handler mHandler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            FragmentActivity activity = getActivity();
            switch (msg.what) {
                case Constants.MESSAGE_STATE_CHANGE:
                    switch (msg.arg1) {
                        // 连接上
                        case BluetoothChatService.STATE_CONNECTED:
                            setStatus(getString(R.string.title_connected_to, mConnectedDeviceName));
                            // 显示欢迎字样
                            mWelcomText.setVisibility(View.VISIBLE);
                            mWelcomText.setText(getString(R.string.welcome_text));
                            // 如果今天出库没有点击退出按钮，要再次初始化页面
                            if (ShareUtils.getBoolean(KEY_IS_STOPING, false)) {
                                showEnterInfo();
                            }
                            // 清空设备列表
                            mConversationArrayAdapter.clear();
                            break;
                        // 连接中
                        case BluetoothChatService.STATE_CONNECTING:
                            mWelcomText.setVisibility(View.GONE);
                            setStatus(R.string.title_connecting);
                            break;
                        // 未连接
                        case BluetoothChatService.STATE_LISTEN:
                        case BluetoothChatService.STATE_NONE:
                            mWelcomText.setVisibility(View.GONE);
                            setStatus(R.string.title_not_connected);
                            break;
                    }
                    break;
                case Constants.MESSAGE_WRITE:
                    byte[] writeBuf = (byte[]) msg.obj;
                    // construct a string from the buffer
                    String writeMessage = new String(writeBuf);
                    mConversationArrayAdapter.add("Me:  " + writeMessage);
                    break;
                case Constants.MESSAGE_READ:
                    byte[] readBuf = (byte[]) msg.obj;
                    // construct a string from the valid bytes in the buffer
                    String readMessage = new String(readBuf, 0, msg.arg1);
                    mConversationArrayAdapter.add(mConnectedDeviceName + ":  " + readMessage);
                    break;
                case Constants.MESSAGE_DEVICE_NAME:
                    // save the connected device's name
                    mConnectedDeviceName = msg.getData().getString(Constants.DEVICE_NAME);
                    if (null != activity) {
                        Toast.makeText(activity, "Connected to " + mConnectedDeviceName, Toast.LENGTH_SHORT).show();
                    }
                    break;
                case Constants.MESSAGE_TOAST:
                    if (null != activity) {
                        Toast.makeText(activity, msg.getData().getString(Constants.TOAST), Toast.LENGTH_SHORT).show();
                    }
                    break;
            }
        }
    };
    
    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        switch (requestCode) {
            case REQUEST_CONNECT_DEVICE_SECURE:
                // When DeviceListActivity returns with a device to connect
                if (resultCode == Activity.RESULT_OK) {
                    connectDevice(data, true);
                }
                break;
            case REQUEST_CONNECT_DEVICE_INSECURE:
                // When DeviceListActivity returns with a device to connect
                if (resultCode == Activity.RESULT_OK) {
                    connectDevice(data, false);
                }
                break;
            case REQUEST_ENABLE_BT:
                // When the request to enable Bluetooth returns
                if (resultCode == Activity.RESULT_OK) {
                    // Bluetooth is now enabled, so set up a chat session
                    setupChat();
                }
                else {
                    // User did not enable Bluetooth or an error occurred
                    Log.d(TAG, "BT not enabled");
                    Toast.makeText(getActivity(), R.string.bt_not_enabled_leaving, Toast.LENGTH_SHORT).show();
                    getActivity().finish();
                }
        }
    }
    
    /**
     * Establish connection with other divice
     *
     * @param data   An {@link Intent} with {@link DeviceListActivity#EXTRA_DEVICE_ADDRESS} extra.
     * @param secure Socket Security type - Secure (true) , Insecure (false)
     */
    private void connectDevice(Intent data, boolean secure) {
        // Get the device MAC address
        String address = data.getExtras().getString(DeviceListActivity.EXTRA_DEVICE_ADDRESS);
        // Get the BluetoothDevice object
        BluetoothDevice device = mBluetoothAdapter.getRemoteDevice(address);
        mChooseDevice = device;
        // Attempt to connect to the device
        mChatService.connect(device, secure);
    }
    
    @Override
    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
        inflater.inflate(R.menu.bluetooth_chat, menu);
    }
    
    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case R.id.secure_connect_scan: {
                // Launch the DeviceListActivity to see devices and do scan
                Intent serverIntent = new Intent(getActivity(), DeviceListActivity.class);
                startActivityForResult(serverIntent, REQUEST_CONNECT_DEVICE_SECURE);
                return true;
            }
            case R.id.insecure_connect_scan: {
                // Launch the DeviceListActivity to see devices and do scan
                //Intent serverIntent = new Intent(getActivity(), DeviceListActivity.class);
                //startActivityForResult(serverIntent, REQUEST_CONNECT_DEVICE_INSECURE);
                saveChooseDevice();
                return true;
            }
            case R.id.discoverable: {
                // Ensure this device is discoverable by others
                ensureDiscoverable();
                return true;
            }
        }
        return false;
    }
    
    
    /**
     * 保存当前device address
     */
    private void saveChooseDevice() {
        // Check that we're actually connected before trying anything
        if (mChatService.getState() != BluetoothChatService.STATE_CONNECTED) {
            Toast.makeText(getActivity(), R.string.not_connected, Toast.LENGTH_SHORT).show();
            return;
        }
        // 保存设备
        if (mChooseDevice != null) {
            ShareUtils.putString(SAVE_DEVICE_KEY, mChooseDevice.getAddress());
            Toast.makeText(getActivity(), getString(R.string.device_save_success), Toast.LENGTH_LONG).show();
        }
    }
    
}
